On Wed, Apr 13, 2016 at 5:45 PM, Gerd Hoffmann <kra...@redhat.com> wrote: > Read absolute and relative axis information, only classify > devices as mouse/tablet in case the x axis is present.
I, too, had to come up with a heuristic to classify input devices in my guest driver and what I ended up with is different. For example my Dell keyboard has two endpoints, one with a bunch of keys and LEDs, so it would be classified as a keyboard. The second one with special keys (KEY_MUTE, KEY_WWW, KEY_BACK, ..) *and* with a mouse (REL_X, REL_Y, REL_WHEEL, BTN_LEFT, ...). The reason for this are the zoom in/out buttons. Pressing them generates Ctrl down on the first endpoint and mouse wheel up/down on the second one. Releasing them then translates to Ctrl up. Crazy. So I wouldn't use exclusive OR when classifying because there are combo devices out there. Maybe anything with an EV_KEY (minus BTN_*) would be a keyboard? Ladi
